Percentage composition of nitrogen in ammonium sulfate? (1 Viewer)

[failedtrials]

So far i've found the moles of ammonium. What is a relevant equation to find the moles for nitrogen?

 

[Queenroot]

failed trials

 

[seventhroot]

n=m/M or the other way around, can't remember

 

[failedtrials]

n=m/M or the other way around, can't remember

I mean the chemical equation, or am i doing something wrong

 

[failedtrials]

failed trials

Yes? Yes that would be me.

 

[Queenroot]

Do some research, not hard to find the equation.

 

[failedtrials]

Do some research, not hard to find the equation.

You think i haven't done that already? Posting here was my last resort

 

[seventhroot]

You think i haven't done that already? Posting here was my last resort

I Google'd and it was the first link ._.

 

[Queenroot]

What are you reacting it with?

 

[seventhroot]

What are you reacting it with?

I think s/he means in general? In this case, mass of nitrogen/mass of molecule

 

[failedtrials]

I Google'd and it was the first link ._.

It's not really what i was looking for

 

[Queenroot]

Wat, elaborate
Do you want the chemical formula for it? Then it is just a simple google search.
If you want an equation, that means you're reacting it with something/it is a product, so tell me what those are.

 

[seventhroot]

Wat, elaborate
Do you want the chemical formula for it? Then it is just a simple google search.
If you want an equation, that means you're reacting it with something/it is a product, so tell me what those are.

I guess this is why he failed trials hue

 

[failedtrials]

I think s/he means in general? In this case, mass of nitrogen/mass of molecule

I'll just post the whole question.

You are given to analyse the concentration of nitrogen in a sample of ammonium sulfate fertilizer. Precipitate the sulfate ion from solution using barium nitrate and then use the mass of precipitate formed to determine concentration of nitrogen.

Mass of fertilizer: 14.21
Mas of barium sulfate precipitated: 1.15
Determine percentage of composition of nitrogen in fertilizer

 

[failedtrials]

I guess this is why he failed trials hue

Damn man. That stings

 

[Queenroot]

I'll just post the whole question.

You are given to analyse the concentration of nitrogen in a sample of ammonium sulfate fertilizer. Precipitate the sulfate ion from solution using barium nitrate and then use the mass of precipitate formed to determine concentration of nitrogen.

Mass of fertilizer: 14.21
Mas of barium sulfate precipitated: 1.15
Determine percentage of composition of nitrogen in fertilizer

Here's your equation:

Ba(NO3)2(aq) + (NH4)2SO4(aq) → 2NH4NO3(aq) + BaSO4(s)

 

[failedtrials]

Here's your equation:

Ba(NO3)2(aq) + (NH4)2SO4(aq) → 2NH4NO3(aq) + BaSO4(s)

I really suck. How do i find the moles of nitrogen?

 

[Queenroot]

n = m/mm
moles of BASO4 = 1.15/(molar mass of BASO4 I ceebs calculating)
From equation we see that there are 2 moles of nitrogen in ammonium sulfate.

We now take the moles of BASO4 and multiply this by 2.
So moles of Nitrogen = moles of BaSO4 x 2

To find the original conc, are they asking for w/w% or w/v%?

 

[failedtrials]

It didn't mention that, but i think its safe to assume w/w%.

 

[Queenroot]

It didn't mention that, but i think its safe to assume w/w%.

Okay, then from the moles of Nitrogen you'd find the mass.
So Mass of Nitrogen = moles of Nitrogen x molar mass of nitrogen.

Then iirc you put:
(mass of nitrogen/14.21) x 100 = w/w%

I'm not sure, been ages since I did this. Someone pls confirm.